Bearing shells question

[Doug 13]

I was measuring my crank bearing shells thickness. They are .010 under. l noticed they are very close to 0.100 thick. Would .010 under shells be 0.100 thick when new? Crank end play is to the wear limit. Will new properly sized shells correct this?

 

[TheOldHokie]

(quoted from post at 22:41:29 09/29/22) I was measuring my crank bearing shells thickness. They are .010 under. l noticed they are very close to 0.100 thick. Would .010 under shells be 0.100 thick when new? Crank end play is to the wear limit. Will new properly sized shells correct this?

Measure the crankshaft journals not the shells.

TOH

 

[ASEguy]

In automotive, .010 under bearings are stamped on the backing .010. Measure your crank as posted for actual diameter, out-of-round and taper.
Typically the out-of-round max and taper max is .001. Plastigauge all of the bearings to make sure you are in the specifications window. If you do not know how to use plastigauge, just ask.
A new thrust bearing should correct the endplay issue. If it does not a crank will be needed. If you are at the wear limit, it should.

 

[teddy52food]

A .010 shell will only be .005 on each half. Measure the crank & get bearings to fit.

 

[John Deere D]

Measure the Crankshaft Journals....

Deduct any Tapper or other anomalies from the reading of each Journal...

IF required have journals machined round.

Order the correct undersize bearing shells.
Check Clearnce as per pictures...Plastigage

Bob...

 

[Doug 13]

(quoted from post at 07:12:23 09/30/22) Measure the Crankshaft Journals....

Deduct any Tapper or other anomalies from the reading of each Journal...

IF required have journals machined round.

Order the correct undersize bearing shells.
Check Clearnce as per pictures...Plastigage

Bob...
<img src=https://www.yesterdaystractors.com/cvphotos/cvphoto137051.jpg>

<img src=https://www.yesterdaystractors.com/cvphotos/cvphoto137052.jpg>



<img src=https://www.yesterdaystractors.com/cvphotos/cvphoto137053.jpg>

Crank journals caliper out ok. I just thought shell thickness would be another way to measure. Plasti gauge works good just picked some up. Instructions say the weight of the crank and the flywheel should be on the plasti gauge. Little hard to install flywheel as the block is on a stand. I probably spend to much time measuring.
Thanks for the photos and info.

 

[John Deere D]

Quote:
Instructions say the weight of the crank and the flywheel should be on the Plastigage.

Well,well,well.
I have only ever had the block turned over, (on a Stand or on a work bench)180 deg, Crankshaft facing 12 o'clock...

Plastigage then placed between bearing shell running surface/face and Crankshaft Journals.

I'm totally lost on Instructions say the weight of the crank and the flywheel should be on the Plastigage...

Bob..Pick of a Ferguson TEA-20 Standard Engine...

 

[TheOldHokie]

(quoted from post at 21:08:43 09/30/22)

Crank journals caliper out ok. I just thought shell thickness would be another way to measure. Plasti gauge works good just picked some up. Instructions say the weight of the crank and the flywheel should be on the plasti gauge. Little hard to install flywheel as the block is on a stand. I probably spend to much time measuring.
Thanks for the photos and info.

You can never spend too much time measuring or reading the instructions. You might want to read your instructions again. And ditch the calipers and use a micrometer for measuring crankshaft journals.

Plastigage is used to measure diametric clearance and you must eliminate all backside clearance to do that. The crankshaft journal [u:49d68d234b][b:49d68d234b]MUST[/b:49d68d234b][/u:49d68d234b] be in direct contatct with the [b:49d68d234b][u:49d68d234b]UPPER[/u:49d68d234b][/b:49d68d234b] bearing insert. Thats exactly what you get on an engine stand. You dont need or even want the flywheel mounted.

If using plastigage on an engine that is still in the vehicle jacks should be used to support the weight of the crank and and any other component(s) (e.g. flywheel) and hold the journals up against the upper insert.

TOH

This post was edited by TheOldHokie on 10/01/2022 at 06:48 am.

 

[Doug 13]

Ok, TOH I will use plasti gage as you said. Thanks